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I think the update of google has been for the EMD
Penguin is off-page -- off-site [inbound links, inbound link text, natural links v. appearing requested / manipulative, etc.]
A lot of the posts here are picking out over-optimization factors like high on-page keyword ratio and anchors as a ranking problem, all things that are pretty characteristic of Penguin.
We haven't built a single link
Neither had I, but the first Penguin got me.
too many pages to "improve"...
Doesn't google usually announce when Panda updates roll out, even belatedly?
This could be what is happening to some of you that say you have never built any links, google may be identifying links as bad when they are not.
I read about others affected by Panda and Penguin, but until it happens to you, the others are "bad people/sites", anyway.